Gas pump skimmers are getting craftier. A new scam out of Oklahoma that netted thieves $400,000 before they were caught is a reminder of why it’s usually best to pay with credit versus debit cards when filling up the tank.

The U.S. Attorney’s office in Muskogee, Okla. says two men indicted this month for skimming would rent a vehicle, check into a local hotel and place skimming devices on gas pumps at Murphy’s filling stations located in the parking lots of Wal-Mart retail stores. The fraud devices included a card skimmer and a fake PIN pad overlay designed to capture PINs from customers who paid at the pump with a debit card.

The series [Brian Krebs has] written about ATM skimmers, gas pump skimmers and other related fraud devices have become by far the most-read posts on [his] blog. [He] put this gallery together to showcase the entire series, and to give others a handy place to reference all of these stories in one place. Click the headline or the image associated with each blurb for the full story.